Tech companies have been scrambling to clamp down on the graphic footage.
He said "assurances were given" that once such content was pulled down, a regime would make sure it did not go back up. "This is a case where you're giving a platform for hate. We will do whatever is humanly possible for it to never happen again". Warner highlighted the speed and scope of how the material was shared.
This was not the first time Facebook Live has been used to broadcast atrocities - a murder was live-streamed in the U.S. city of Cleveland in 2017 - and Facebook and Twitter say they have invested in technology and human resources to combat the problem.
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He said: "It had to be a special night and it was, not just for the goals, but for the team and their incredible attitude". The five-time Ballon d'Or victor once again wrote his name into the record books with a stellar show.
Twitter, YouTube owner Google and Reddit also were working to remove the footage from their sites.
The company made the announcement in a Tweet, following up on a prior announcement that it had been alerted by authorities and removed the alleged shooter's Facebook and Instagram accounts.
Facebook also said in a statement it had removed the footage and was also pulling down "praise or support" posts for the shootings. "We also cooperate with law enforcement to facilitate their investigations as required", it said. According to Reuters, New Zealand Prime Minister Jacinda Ardern indicated that she wants to speak with the company about live streaming, while British Labor leader Jeremy Corbyn said that such platforms must act, and raised the question about regulation.
The app is usually used to share videos of extreme sports and live music, but on Friday the footage recreated the carnage of a computer game, showing the attacker's first-person view as he drove to one mosque, entered it and began shooting randomly at people inside.
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Page went on to reveal that there was a significant assumption being made. "That's important. It is past time for someone to look at the other side of the political coin.
With billions of users, Facebook and YouTube are "ungovernable" at this point, said Vaidhyanathan, who called Facebook's livestreaming service a "profoundly stupid idea".
"One of the most complex global governance challenges confronting the worldwide community is the norms of how social media is to be regulated - with the added complexity that the objects of such norms are no longer sovereign states, but private businesses with platforms larger than most countries by population".
Despite taking swift action, stopping the spread of unverified content may prove to be a tough challenge for Facebook and YouTube.
Industry groups representing advertisers issued a statement asking their members if they wanted to be "associated" with platforms that did not take responsibility for the content being shared.
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New Zealand Police confirmed they had responded to shots fired in central Christchurch at around 13:40 local time (00:40 GMT). Wicket-keeper Mushfiqur Rahim also described the scenes of panic, saying the team had been " lucky " to escape the violence.
"Shocking, violent and graphic content has no place on our platforms, and we are employing our technology and human resources to quickly review and remove any and all such violative content on YouTube".